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A balanceed three-phase load of 15 MA with a lagging load factor of 0.85 is supplied by a 115KV subtransmission line. if the line impedance is 50+j100Ohm per phase, determine the following: (a) The
A three-phase, wye-connected induction motor is supplied by a three-phase and foursin system with line-to-line voltage of 220V and the impedance of the motor is 6.3+j3.05Ohm per phase.
Suppose that without a 1k-ohm load an amplifier's output voltage is 5Vpp but when the 1k-ohm load is attached, it drops to 3Vpp. What is the output impedance of the amplifier
1. a nichrome wire 12 ft long and .011 inch diameter conducts 1.83A when 120v are applied. what is the resistivity of nichrome 2. Copper windings of an electric motor at room temperature of 25 degrees
A large reel of paper installed at the end of a paper machine. d1 = 2m, J = 1000kgm^2, n1 = 60rpm, Tension on Paper = 1000N. Calculate: a. Motor power when the reel turns at 60rpm. b. Torque to incr
A 50HP single phase motor operates from a 480V, 60HZ supply. When delivering full rated power the motor efficiency is 89% and the power factor is 0.78 lagging. Determine the full load current.(Hint:
an amplifier has three amplification stages and a 1-dB attenuator in cascade. Assuming that all the impedances are properly matched, what is the overall gain if the amplification factors are 5, 10,
The number of students arriving at Mary's office hours is modeled as a Poisson random variable with an average of 1 student every 15 minutes. (a) What is the probability that no students arrive duri
encounter a sequence of birds while walking in the park. The birds can either be blue (B) or red (R). We let X be the random variable corresponding to the number of birds we encounter until seeing t
Two small plastic spheres are given positive electrical charges. When they are a distance of 15.6{\rm cm} apart, the repulsive force between them has a magnitude of 0.235{\rm N} .What is the charge
A 3-phase 230 V, 9 kVA, 0.9 PF (lagging) load is supplied by 10 kVA, 1330/230 V, 60 Hz three-phase transformer connected in Y-?. The equivalent impedance of transformer referred to the low-voltage s
Signal generator‘s internal impedance is purely resistive and has an open-circuit voltage of 3.5 V. When the generator is loaded with 22 ohms of resistance, its terminal voltage drops to 2.8 V
A project manager placed an order for ball bearings for some heavy duty manufacturing machinery. What is the surface area in square millimeters of one of these bearnings if it has a diameter of 0.4
The springs effect is addressed below. As a relay some contacts are connected to, and move with, the armature. Other contacts are stationary and would make or break contacts as the armature moves.
Frequently, the output of transducers are much smaller than what an A/D converter expects on its input. That would require an amplifier to match it. Sometimes the output does not start at 0V. Usuall
A temperature sensor covers a range of 0 to 70 degrees C with an output sensitivity of 2 mV/degree C. The sensor is input to an ADC with voltage range of 0 to 4V. What is the value of the feedback r
Assume the coil around the toroid is one single coil and extends all the way around. A toroid is like a donut with a circular cross section. The following characteristics are given: Toroid material
A HCS12 ATD is set to 8-bit unsigned mode. A temperature sensor measuring 0 to 100 degrees with an output of 25 mV/degree is attached to the input. The ATD low voltage reference is attached to groun
Find a minimum two level circuit (corresponding to the sum of products expressions) using AND and one OR gate per function for each of the following sets of functions: f(a,b,c,d) =fm(1,3,5,8,9,10,13
A platinum resistance coil has a resistance at O0 C of 100 . Determine the change in resistance that will occur when the temperature rises to 30°C if the temperature coefficient of resistance is
What will be the output voltage from the bridge for a change in temperature of 20o C The supply voltage to the bridge is 6.0 V and the temperature coefficient of resistance of the platinum is 0.0039
The sun is at an altitude of 30 degrees to the horizontal. What is the corresponding air mass What is the physical significance of air mass Mars has a very thin atmosphere containing primarily CO_2
The global radiation at the solar noon on a summer solstice in Albuquerque, New Mexico (latitude 35° N) is 60mw/cm^2. Assume that (a) 30 % of this irradiance is diffuse radiation and (b) the gro
Design a full-wave bridge rectifier circuit to deliver 10 volts de with less than 0.1 volt (pp) ripple into a load draWing up to 10mA. Choose the appropriate ac input voltage. assuming 0.6 volt diod
Compare this spectral distribution with that of the radiation received on the surface of the earth at AM1.5. Briefly explain the causes of the difference between the emitted radiation of the core of